Rotary duplicating machine



N O s D U H R. G.

RDTARY DUXLICATING MACHINE 4 Sheetssheet 1 Filed Aug. 21, 1937 J. L l

@et l, i940 G. R. HUDSON ROTARY DUPLCATING MACHINE Filed Aug. '21. 1937 LA qu? l l l I.

4 Sheets-Sheet 2 @MMWM N o s D U H R. e.

4 Sheets-Sheet 3 Filed Aug. 21V-ffl??? Y a wm 6V A v mh www Oct. l, 19401 Filed Aug. 2l, l193'? 4 Sheets-Sheet 4 7 5 8 9 7 of@ o 8 ww wd/.Z m/G wm M\G iM/M0 AMM MDM 3mm H www mmm mmm Wg. 8% mn lli H1 l e m w f \|.7 M f3 l of e 0 4- 0,0 WY \|H\||\ IHI HWI 00/ Hl|l.i 5 ww. mA En. n@ mn mw Patented Oct. l, 1940 UNrrED STATES ROTARY DUPLICATING MACHINE George R. Hudson, London, England, assigner to Ditto, Incorporated, Chicago, Ill., a corporation of West Virginia Apparition August 21, 1937, serial No. 160,226

11 claims.

The invention relates to duplicating machines and is particularly adapted to be embodied in duplicating machines of the type wherein the copy sheets are moistened with a solvent which will dissolve carbon o-r ink upon a master sheet, the method practiced to produce the copy sheets being such that each moistened copy sheet is brought into contact with the master sheet, whereupon ythe solvent dissolves part of the ink or carbon of the data on the master sheet and the dissolved ink or carbon is transferred to the copy sheet.

The master sheets have the data to be duplicated, written or typewritten thereon in reverse so that when a portior. of the carbon or ink is dissolved land transferrrd tothe moiostened surface of a copy sheet, it will appear in correct readable form.

One form of he invention is embodied in a duplicating machine which comprises a drum adapted to carry a master sheet having data printed or typewritten in reverse thereon. The master sheet is apertured and a second master sheet in the form of a relatively long strip is adapted to be advanced past said aperture in the first-mentioned master sheet in a step by step manner so that the data on the` second master sheet may be different each time a copy sheet is applied tothe two master sheets. With this construction, the ast master sheet may be -a letter and the second master sheet may carry a plurality of addresses so that a different address may be imprinted upon each copy sheet.

An object of the invention is to provide improved means for holding the first-mentioned master sheet and for guiding the secondmentioned master sheet.

Other objects and advantages will become apparent as the following detailed description progresses, reference being had to the accompanying drawings, wherein- Fig. 1 is a side elevation of a duplicating machine which embodies the invention.

Fig. 2 is a plan view 'of the 'improved machine.

Fig. 3 is a fragmentary vertical longitudinal section taken on line 3-3 of Fig. 2.

Fig. 4 is an enlarged fragmentary section taken on the same line as Fig. 3. 4.

Fig. 5 is a View of a master sheet adapted to be employed ir. the improved machine.

Fig. 6 is a view of a second master sheet adapt- 4ed to co-operate with the master sheet shown in Fig. 5, and

Fig. 7 is a perspective view of a clip which is (Cl. lill-132.5)

employed in the improved machine to secure the master sheet shown in Fig. 5 in the machine.

While the invention has been disclosed in a duplicating machine o? the type wherein the copy vsheets are moistened with solvent for the ink or carbon which is to be transferred to the copy sheets, it is to be understood that the invention yis limited to such use only to the extent indicated in the appended claims.

Referring to the drawings wherein a pre- 10 iferred embodiment of the invention '1s disclosed, the reference character Il) designates generally a frame which comprises sideframes II and I2. Rotatably journalled in the side frames I I and I2 is a shaft 3 with which a duplicating drum our l5 cylinder I4 is constrained to rotate. It will be noted that the duplicating drum I4 comprises an arcuate platen member I5 which, in this instance, is less than degrees in angular length with respect to the axis of rotation of the drum. It 20 will be noted that the drum I4 is open at its side except for the arcuate platen member I5, the platen member I5 being carried by end Walls I8 of the drum. Constrained to rotate with the shaft I3 is a gear I8 which meshes with a pinion 25 I9``1Xed to a shaft 20 which is journalled in the side frame I2. At its outer end, the shaft 20 is provided with a crank lever 2| whereby the operator may rotate the pinion I9 and thus rotate the gear I8 so that the drum I4 will rotate. Mesh- 30 ing with the gear I8 is a gear 22 rotatably journalled 'on a stub shaft 23 mounted in the frame I0. The gear 22 meshes with a gear 25 rotatably journalled on a stub shaft 26 mounted in the frame I0. Meshing with the gear 25 is a pinion '35 28 constrained to rotate with a shaft 29 which has its ends rotatably journaled in the side frames I I and I2. The shaft 29 has mounted thereon a roller 3D which co-operates with a second roller 3I to advance copy sheets toward 40 the drum I4, the roller 3I being driven through its frictional engagement with the roller 30. Cooperating with the platen I5 is a platen roller 33 mounted on a shaft 34 which has its ends rotatably journalled in the free ends of the levers 35, 45 the levers being pivoted upon a shaft 36 mounted in the frame I0. Means is provided for bringing the platen roller 33 rinto an adjusted position with respect to the platen I5. This means comprises links 38, each of which has one of its ends pivoted 50 to one of the levers 35 by a pin 39. The other end of each link 38 extends through an aperture 4I) in one of two brackets 4I. Each bracket 4I has one end pivoted to the frame I0 by Va pin 44. Nuts 43 screw-threaded upon the last mentioned 55 will be noted that angular displacement of the lever 48 is limited in a counterclockwse direction (Fig. 1) by a stop pin 50 which projects from. the side frame I2.

It will be readily understood that when the improved machine is in operation and the drum I4 is being rotated, the platen I5, or anything carried on its outer surface, will bear against the platen roller 33 and tend to displace the roller 33 in a counter-clockwise direction (Fig. 1)

around the shaft 36. It may be mentioned that the roller 33 is preferably formed from a yieldable material such as rubber and therefore may be compressed to some extent by the platen I5 or the material carried thereon. If it is desired to have the platen roller bear with greater force against a master sheet mounted on the platen I5, the nuts 43 may be manipulated to draw the links 38 to the' right (Fig. 1) and if it is desired to have the platen roller bear with less force against the master sheet mounted on the platen I5, the nuts 43 may be manipulated to have the links 38 free to move to the left (Fig. 1). The lever 48 is shown against the stop 58, in which position it holds the shaft 41 in a pusition wherein the eccentrics 46 have exerted' their maximum throw against the free ends of the brackets 4I. It will be readily understood that if the lever 48 is displaced in a clockwise direction (Fig. 1), the eccentrics 46 will rotate into positions wherein they will not exert their maximum throw upon the brackets 4I and the brackets will be free to move a short angular distance in a clockwise direction (Fig. 1) around the pins 44 and the roller 33 will then exert less force upon the master sheet mounted upon the platen I5. In practice, the nuts 43 may be adjusted to bring the roller 33 into the desired position when the lever 48 is in an intermediate position so that thereafter the operator may vary the position of the roller 33 toward or away from the drum I4 by angularly displacing the lever 48 in a counter-clockwise direction or clockwise direction, respectively. (Fig. 1).

As best shown in Fig. 3, the solvent for moistening the copy sheets, so that they Will dissolve the ink or carbon on the master sheet, is preferably applied to the copy sheets by a felt strip 52 which is supplied with the solvent from a receptacle 53. A valve.54 provided with a valve handle 55, controls the flow of solvent from the receptacle 53. When the valve 54 is opened, the solvent drops d own u'pon one marginal portion of the felt strip 52 and then passes through the felt strip to another marginal portion thereof disposed adjacent th'e platen roller 33. The latter portion of the felt strip 52 projects from beneath an L- `shaped member 56 formed integral with bracket members 51 which are pivoted to the side frames II and I2 by pins 58. 'I'he felt strip 52 is supported upon a sheet metal plate 60 carried by the brackets 51 and projecting upwardly from the plate 60 and from the brackets 51 is a plate 62, to the upper end of which plate 62 the receptacle 53 is secured. It will be noted that the felt strip 52. the brackets 51, the plates 60 and 62 and the receptacle 53 can all be oscillated as a unit around the coincident axes of the pins 58.

Rigidly secured to one of the brackets 51 is an arm 65 which carries a roller 66 engageable with a cam 61 constrained to rotate with the shaft I3. The csnstruction of the cam 61 is such that once during each revolution of the drum I4, the cam 61 engages the roller 66 and acting through the arm 65, angularly displaces the felt strip 52, together with the other apparatus pivoted by the pins 58, in a counter-clockwise direction (Figs. 1 and 3) around the pins 58 so that the portion of the strip 52 adjacent the roller 33 is lifted or displaced in a direction away from the roller 33. Normally, this portion of the felt strip 52 rests upon one end of a plate 10, which end of the plate 10 is disposed between the felt strip 52 and the roller 33. The other end of the plate 10 is adjacent the bight of the rollers 30 and 3I.

The frame I carries a feed table 12 upon which a stack of copy sheets may be placed and advanced one by one to the feed rollers 30 and 3l. A copy sheet isshown at 13 with its leading edge ai; the bight of the rollers 30 and 3|. When the machine is set in operation and the rollers 30 and 3I begin to rotate, they will advance the copy sheet over the table 18 to be engaged by the platen roller 33 and a master sheet disposed over the outer surface of the platen I5, and such copy sheet will be advanced between the platen roller 33 and the platen I5 and discharged into a tray 15 mounted in the frame I0 (Fig. 1). As the leading end of each copy sheet 13 advances across the plate 10, the roller 66 is engaged by the cam 61 and the felt strip 52 is lifted so that the leading edge of the copy sheet may pass freely beneath the felt strip 52. However, as soon as the leading edge has been engaged by the platen roller` 33 and the master sheet upon the platen I5 so that these members will continue advancing the copy sheet, the cam 61 passes from beneath the roller 66 and the felt strip 52 is lowered to contact the copy sheet and apply the solvent thereto. It will be readily understood that only a small portion at the leading end of each copy sheet will remain unmoistened. Obviously, no attempt is made in practice to have the master sheet imprint data on the unmoistened ends of the copy sheets.

A master sheet is shown at 80 in Figs. 2, 3, 4 and 5. Referring to Fig. 5, it will be noted that the master sheet 80 is provided with a relatively large rectangular aperture 8I intermediate its upper and lower ends. At its upper end, the master shee. 80 is provided with a slot 82 and at its lower end it is provided with a slot 83. It will also be noted that the slots 82 are aligned with the aperture 8| and are of substantially the same length. The master sheet 80 has printed thereon with ink or carbon, data 84 in reverse, which data may be the body portion of a letter, or the equivalent. Obviously, when the data 84 is mcistened with a solvent and a copy sheet is pressed against the data, a portion of the ink or carbon will be transferred to the copy sheet so that a duplicate of the master sheet will be made. However, the data on the copy sheet will not be in reverse as on the master sheet.

A second master sheet 85 is shown in Fig. 6. 'I'he master sheet 85 is relatively narrow and is preferably of a width somewhat less than the length of the slots 82 and 83 and the length of the aperture 8l, the master sheet 85 being adapted to be threaded through the slots 82 and 83 in such manner that it may be drawn along that surface of the master sheet 80 opposite to that bearing the data 84. In this inl l 2,910,591 stance, the sheet 85 is provided with a plurality of addresses 81, v88 and 88 which are printed orV typewritten upon the ymaster sheet in reverse, preferably with the same ink or carbon employed in printing the data 84 upon the master sheet 80. 1

- It will .be noted that adjacent toone end'of the platen I5, which end is. designated 'by the reference character 80, there is a shaft 8| rotatably journalled in the end walls I8 of the drum I4. Secured to the shaft 8| is a plate 82 whichy has its free end disposed adjacent the end 80 of the platen 5 (Fig. 4). The construction is such that one end of the master sheet 80 may be folded over the end 90 of the platen I5 and the folded end may be clamped to the vinner surface of the platen I5 by the free end of the plate 82. 'I'he master sheet 80 may then be trained over the outer surface of the platen I5 and may have its other endlfolded over the other end of the platen and attached thereto by means of a U-shaped clip 85 which is formed from sheet metal and is preferably from sheet metalV having some spring in it so that the clip will clamp the last-mentioned end of. the master sheet 80 to the last-mentioned end of the platen I5. The clip 851s provided with a slot 86 of substantially'the same length as the slots 82 and 88, the slot 86 being aligned with the slots 82 and 83.` In practice, the master sheet 85, which is in the form of a long strip of paper, or the equivalent, is threaded through the slots 86, 82 and 83 in such manner that a portion of it is disposed between the outer surface of the platen I5 and that portion of the. master sheet 80 lying between the slots 82 and 83. It' will be notedlfrom Fig. 3 that the slots 82 and 83vare so disposed in the master sheet 80 that -they lie in the edges of the folded portions of the master sheet at the two ends of the platen I5.

One end of the master sheet 85 is wound in a roll upon a spindle which is journalled by pins mounted in the lower ends of brackets IOI rigidly secured to the inner surfaces of the end discs or plates I6 of the drum I4. 'I'he other end of the master sheet 85 is wound upon a spindle |04 which has its ends mounted upon pins mounted, in turn, in the upper ends of the brackets IOI. Intermediate the end 80 of the platen I5 and the spindle 04, the master sheet 85 is trained over a roller |06 and is also trained between the roller |06 and a roller |01. The roller |06 is mounted upon a shaft |08 which has its ends rotatably journalled in the end discs or plates I6. A pulley ||0 with which the shaft |08 and the roller |06 are constrained to rotate, is connected operatively by a belt II I to a pulley |I2 mounted upon one of the pins which support 'the spindle |04. This pin is shown atv I|5 in Fig. 2 and by dotted lines in Fig. 3. The

spindle |04 is constrained to rotate with the pin` I I5 and the pin is constrained to rotate with the pulley ||2.

At one end, the shaft |08 is provided with a pinion |I6 adapted to engage a short gear segment |I1 rigidly secured to the side frame I2 l(Figs. l and 2), the construction being such that each time the drum |4 is rotated through a complete revolution, the pinion ||6 will engage the gear segment ||1 and will be rotated by' it in a counterclockwise direction (Fig. 1) so that the shaft |08 and the'roller |06 will be rotated in a counterclockwise direction (Figs. 3 and 4) and the roller '|06' will co-operate with the roller |01 to advance the master sheet 85 toward the spindle |04. It is understood, of course that a portion of the master sheet 85 is simultaneously unwound from the spindle |00.

The means for causing the plate 82 to clamp one end of the master sheet .80 against the end 80 of the platen I5 comprises a lever I 20 which has one end secured to one end of the shaft 8| One end of a tension spring I2| is secured to the -free end of the lever I 20, the other end of the spring |2I being secured to a pin |22 projecting from the side frame II.' The spring yieldingly urges the lever |20 and the plate 82 in a clockwise direction (Fig. 4) to perform its clamping operation.V When it is' desired to remove the master sheet 80-from the drum I4, the operator displaces the lever |20 in a counterclockwise direction (Fig. 4) against the action of the spring |2I so that the Iplate 82 is disengaged from the master sheet 80.

The roller |01 is mounted upon a shaft |25 which has its .ends journalled in levers |26 mounted upon hubs |21 formed integral with the end discs o'r plates I6 (Fig. 3). Attached to each The operation of the above described appa' ratus is substantially as follows: If it is assumed that the master sheet 80 has been secured on the platen I5 by the plate 92 and the clip 85 in the manner described above and if it is assumed that one end of the master sheet 85 has been unwound from the spindle |00 and advanced through the slots 96, 83 and 82, and wound upon the spindle |04 so that a portion of the master sheet 85 is disposed between the platen I5 and the master sheet 80, it will be readily understood that a small portion of the master sheet 85 will be exposed through the aperture 8| in the master sheet 80. It will be further understood that each time the mastersheet 85 is advanced toward the spindle |04, another portion of the master sheet 85 will be exposed through the aperture 8|. Obviously, the master sheet 85 will be advanced over the platen- I5in a step by step manner, the construction being such that eachtime thel drum |4is rotated through a complete revolution,the pinion I|0 and the gear segment |I1 will co-operate to rotate the roller |06 and it will pull the master sheet 85 a short distance toward the spindle |04.

The spindle |04 is driven by the belt II and the pulley |I2 and the advanced portion of the master sheet 85 will be wound upon the spindle 04. There will be suilicient slip between the belt III and thepulley I I2 to compensate for the increase in diameter of the roll of the master sheet 85 being'formed upon the spindle |04. Now if it is assumed that the data 84 on the master sheet 80 is a letter, or the equivalent, and that the data on the master sheet 85 are a plurality of addresses 81, 88 and 89, it will be readily understood that the master sheet may be brought into an adjusted position so that the rst of these addresses will be exposed in the aperture 8| when the machine ls to be operated. It will also be understood that the addresses may be spaced in such manner that each time the master sheet 85 is advanced, a new address will appear in the aperture 8|. Now if the. master sheet 85 has been adjusted in this manner and the drum I4 has been brought into its proper position with respect to the platen roller 33, the operator may advance acopy sheet 13 to the rollers 38 and 3| and then operate the machine by the crank lever 2|, whereupon, the feed rollers 38 and 3| will advance the copy sheet so that it will be engaged by the roller 33 and the portion of the master. sheet 80 which is clamped to the end 80 of the platen |5. 'I'he master sheet 80 and the roller 33 will then cooperate to advance the copy sheet between them. As described above, the felt strip 52 was raised momentarily while the leading edge 'of the -copy sheet passed beneath it, but it is lowered into contact with ,the copy sheet as soon as the mas-Y ter sheet 80 co-operates with the roller 33 to advance the copy sheet. The upper surface of the copy sheet is then moistened with the solventl and as it comes into contact with the data on the master sheet 80 and the address exposed iii the aperture 8|, the data andthe address will be duplicated upon the copy sheet in correct readable form. The copy sheet is discharged into the tray 15. After the address was copied on the copy sheet, the pinion ||6 engaged the gear segment |1 and advanced the copy sheet 85 the required distance to have the following address appear in the aperture 8| so that during the next cycle of operations, the following address will appear on the next copy sheet.

. It should be mentioned that the drum I4 is rotated in a counter-clockwise direction (Fig. 3) so that the end 90 of the platen |5 Yis the leading edge of the platen. Intermediate the spindle |00 and the trailing edge of the platen, is a roller which has its ends rotatably journalled in the end discs or plates I4. The copy sheet 85 is trained over the roller |40 lso that it will readily enter the slot 96 in the clip 95.

81, 88 and 88 may be printed thereon in reverse.v

This will permit one to produce a relatively large number of letters having different addresses thereon. f

To register the drum |4 in its correct position with respect to the roller 33 at the beginning of a cycle of operations, a mark (not shown) may be made upon the drum |4, which mark may be registered with another mark or pointer (not shown) made on or projecting from the frame I0.

As best shown in Figures 1 and 2, a second gear segment ||1a is pivotally mounted upon the said frame I2 by a pin ||1b. In Figure 2 the gear segment ||1a is shown in a functionally inoperative position, but it will be understood that it may be displaced into the position. wherein it is shown in dotted lines in Figure 2. When the gear segment |1a is in the position wherein it is shown in dotted lines in Figure 2, the gear segment |1a co-operates with the gear segment ||1 so that the pinion I6 is rotated by the segments each time the drum I4 makes a complete revolution. The angular distance through which the pinion |6 is rotated by the gear segments ||1 and 1a is larger obviously than the distance through which the pinion is rotated when the gear segment |1 acts alone upon the pinion. It will be readily understood that the master sheet 80 will then be displaced through a greater distance, and it is obvious that additional data may be printed upon the master sheet 80 and will be transferred to the copy sheets.

While I have shown and described certain embodiments of my invention, it is to be understood that it is capable of many modiiications. Changes, therefore, in the construction and arrangement may be 'made without departing from v the spirit and scope of the invention as disclosed in the appended claims, in which it is my intention to claim all novelty inherent in my invention as broadly as permissible, in view of thel of said spindles tol lie between said platen and the first-mentioned mastery sheet and thence through the aperture in said U-shaped member to the other spindle, said second master passing beneath the aperture in the rst-mentioned master sheet, means for advancing copy sheets to said duplicating drum, means for applying a solvent to said copy sheets, a platen roller for pressing said copy sheets against the first-mentioned master sheet and that part of the second master sheet appearing through the aperture in the rst-mentioned master sheet, means for rotating said duplicating drum, a pinion with which one of said spindles is 'constrained to rotate and a gear segment on said frame and engageable with said pinion to rotate it once during each revolution of said duplicating drum whereby said second master sheet is advanced a predetermined distance on said arcuate platen each time the duplicating drum makes a complete revolution.

2. In a duplicating machine, a frame, a duplicating drum rotatably journalled in the frame, said duplicating drum including an arcuate platen, means for clamping one end of a master sheet to one end of said platen, an apertured U-shaped member for securing the other end of said master sheet to the other end of said platen, said master sheet having three apertures therein, a pair of spindles rotatably journalled in said drum whereby a second master sheet in strip-like form may be trained from one of said spindles to lie between said platen and a portion of the first-mentioned master sheet and thence through the aperture in said U-shaped member to the other spindle, said second master passing through two apertures in the first-mentioned master and beneath the third aperture in the first-mentioned master sheet, means for advancing copy sheets to said duplicating drum, means for applying a solvent to said copy sheets, a platen roller for pressing said copy sheets against the first-mentioned master sheet and that part of the second master sheet appearing through said third aperture in the rst-mentioned master sheet, means for rotating said duplicating drum, a pinion with which one of said spindles is constrained to rotate and a gear segment on said frame and engageable with said pinion to rotate it once during each revolution of said duplicating drum whereby said second master sheet 'is advanced a predetermined distance on said arcuate `platen each tured :ll-shaped' member for securing the other end o! said master sheet to the other end of Vsaid amasar time the duplicating anni makes a complete lrev.-

olution.

3. In a duplicating machine, a rramaa duplicating drum rotatably Journalled in the frame,

. said duplicating drum including an arcuate platen, means for clamping one en'd of an apertured master sheetto one end oi' said platen, an aperf platen, a pair of spindles rotatably'journalled in said drum whereby a second master sheet in strip-likeliorm may be trained from one of said spindles to lie between said platen andthe rstmentionedmaster sheet and thence through the aperture in said U-shaped member tothe other spindle, said second masterbeneath the aperture in the mst-mentioned master sheet,

means for advancing copy sheets t0:saididu'pli' cating drum, means for applying a'solvent to said copy sheets, a platen roller ior pressing said copy sheets against .the mst-mentioned masterv sheet and that partof the second master sheet appearingthrough the aperture in the inst-mentioned master sheet, means for rotating said duplicating drum, and means for rotating one'oi-said spin-V dles once during each revolution of saidduplicating drum rwhereby said second master sheet is l advanced a'predetermined distance on said arcuate platen each time the duplicating makesv a complete revolution.

4. In a duplicating machine, a frame, a duplii cating 'drum rotatably journalled in'theframe,

said duplicating d rum including an arcuateplaten, means for clamping one end of a master sheet to one end of said platen, an apertured U-shaped member forsecuring the other end ofI said master sheet to the other end oi said platen, said master sheet having three apertres'therein, a pair oi spindles rotatablyjournalled in said drum whereby a second master sheet in strip-like 1 .'orm may be trained from one of said. spindles to lie between said platen anda portionof the rstmentioned master sheet and thence through the aperture in said U-shaped member to-,the other spindle, said second master passing through .two apertures in the first-mentioned master and beneath the third aperture in the mst-mentioned master sheet, means for advancing copysheets to said duplicating drum, means for applying a solvent to said copy sheets,a platen rollerfor Y pressing said copy sheets against the rstme'ntioned master sheet and that part of the second master sheet appearing through said third apersaid duplicating drum including an :arcuate platen, means for clamping one end of an apertured master sheet to one end of said platen, an apertured U-shaped member for securing the other end of said master sheet tothe other end of said platen, a pair of spindles rotatably journalled in said drum whereby a second master sheet in strip-like form may be trained from one of said spindles to lie between said platen and the first-mentioned master sheet and thence through the aperture in said U-shaped member to the other spindle, said second master passing beneath the aperture in the rst-mentioned sheet, means for advancing copy sheets to said duplicating drum, .means for applying a solvent to said copy sheets, and a platen'roll'er for pressing said copy 'sheets against the first-mentioned master sheet said duplicating drum including an arcuate` platen, means for clamping,- one end oia master sheet Ito one end of said platen, an apertured U-shaped member for securing the other' end o! said master sheet to the other end oisaid platen, said master sheet having three apertures therein,

a pair of spindles rotatably journalled in said drum whereby a second master sheet in strip-like form may be trained from one of said spindles to lie between said platen and aportion ofthe ilrstmentioned master sheet and thence through the aperture in said U-shaped member to the other spindle, said second master sheet passing through two apertures in thel mst-mentioned master sheet and beneath the third aperture in the first-men-'- tioned master sheet, means for advancing copy ing a solvent to said copy sheets, andV a platen roller for pressing said copy sheets against the mst-mentioned master sheet and that part of the second master sheet appearing through the aperture in the first-mentioned master sheet.

'1. In a duplicating machine, a frame,'a duplicating drum rotatably journalled in, the vframe, said duplicating drum including an arcuate platen, means for securing a master sheet to said platen, said master sheet having three apertures therein, a pair of spindles .rotatably v journailed -in said drum whereby a second master sheet in strip-like form may be trainedfrom one l of said spindles to' lie between said platenand a portion of the`iirst-mentioned master sheet and thence tothe other spindle, said second master passing through two apertures in the mst-men'- tioned master and beneath the third aperture in the iirst-mentioned master sheet, means for .ad--y vancing copy sheets to saidv duplicating drum,

a platen roller for pressing'. said copy sheets sheets to said duplicating drum, means for applyy means for applying a solvent to said copy sheets, Y

against the mst-mentioned master sheet and that part of the second master sheet appearing through the third aperture in the mst-mentioned master sheetmeans for rotating said duplicating drum,

and means for rotating one of said spindles each time the drum makes a complete` revolution whereby said second master sheet isadvanced a predetermined distance relative to the first-mentioned master sheet.

8. In'a duplicating machine, a frame, a duplieating drum rotatably journalled in the frame,

said duplicating drum including an arcuate platen, a master sheethaving a plurality of apertures therein, means for securing the master sheet to .said platen, a pair of spindles rotatably Journailed in said drum whereby a second master sheet i apertures in the mst-mentioned master and lbefv neath another aperture in the inst-mentioned master sheet, means for advancing copy sheets to said duplicating drum. means for applying a pressing said copy sheets against the iirst-mentioned master sheet and that part of the second `solvent to said copy sheets, a platen roller forl master sheet appearing through the last-mentioned aperture in the rst-mentioned master sheet, and means for rotating said duplicating drum.

9. In a duplicating machine, a frame, a duplieating drum rotatably journalled in the frame, said duplicating drum including an arcuate platen, means for securing a master sheet to said platen, said master sheet having three apertures therein, a pair of spindles rotatably journalled in said drum whereby a second masten sheet in striplike form may be trained from one of said spindles to lie between said platen and a portion of the rst-mentioned master sheet and thence to the other spindle, said second master passing through two apertures in the mst-mentioned master and beneath the third aperture in the mst-mentioned master sheet, means for advancing copy sheets to said duplicating drum, means for applying a solvent to said copy sheets, a platen roller for pressing said copy sheets against the iirst-mentioned master sheet and that part of the second master sheet appearing through the third aperture in the first-mentioned master sheet, means for rotating said duplicating drum, and means for'rotating one of said spindles each time the drum makes a complete revolution whereby said second master sheet is advanced a predetermined distance relative to the first-mentioned master sheet, and a second means movable. into a position to co-operate with said means for rotating one of said spindles to rotate said spindle through an additional angular distance.

10. In a duplicating machine, the combination of a frame, a drum rotatably mounted on said frame, means for releasably securing on said drum a exible form member extending only partially about the drum and having an opening therethrough at an intermediate point thereaiong, means for movably mounting a exible form strip on the face of said drum underneath said rstnamed form memberI so as to bemovable circumferentially of the drum underneath said opening in the mst-named form member and between said first-named form member and the face of the drum, means for rotating said drum, means for giving said form strip a sliding movement about a portion of the 4 face of the drum upon each revolution of the drum for shifting the strip with respect to said lirst-named form member, and means for causing a copy sheet to be brought into operative duplicating relationship with said form member and with the portion of said form strip exposed through said opening as said drum l rotates. l

11. In a duplicating machine, the combination of a frame, a drum rotatably mounted on said trame, means for releasably securing on said drum a flexible master sheet extending only partially about the drum with its end portions turned into reverse 'position about the wall of thedrum and having an opening therethrough at an intermediate point therealong and other openings therethrough at the points where the endportions are turned back, means for movably mounting a 1 second flexible master sheet inthe form of a strip on the face of saidI drum underneath said first-named master sheet and extending Vthrough said second-named openings so as'to be movable circumferentially of the drum underneath said" first-namedv opening in the first-named master sheet, means for rotating said drum, means for giving said second master sheet a longitudinal movement rwith respect to the drum upon eachrevolution of the drum, means for pressing a copy sheet into face engagement with said rst-named mastersheet and with the portion of the second `master sheet exposed through said opening as said drum rotates, and means for applying a solventto said copy sheets in advance of their engagement with said master sheet for enabling the sheets to take copies from said master sheet.

GEORGE R. HUDSON. 

